| Code | Name | Region |
|---|---|---|
| USPE3 | Pine City | NY |
| USPJF | Pine Cove | CA |
| USPF6 | Pine Forge | PA |
| USVZV | Pine Grove | CA |
| USPZG | Pine Grove | PA |
| USPGJ | Pine Grove, Clearfield | PA |
| USPNH | Pine Hall | NC |
| USPID | Pine Hill | AL |
| USVHP | Pine Hill | NJ |
| USYPI | Pine Island | MN |
| USPNI | Pine Island | NY |
| USIKN | Pine Knot | KY |
| USPZY | Piggott | AR |
| US7PR | Pike Road | AL |
| USPXZ | Pikesville | MD |
| USPKU | Piketon | OH |
| USPKK | Pikeville | KY |
| USPK6 | Pikeville | NC |
| USPIK | Pikeville | TN |
| USPGX | Pillager | MN |
| USPP7 | Pillow | PA |
| USPM8 | Pilot Mountain | NC |
| USPIP | Pilot Point | AK |
| USPQP | Pilot Point | TX |
| USPQS | Pilot Station | AK |
| USPIW | Pilottown | LA |
| USGPM | Pima | AZ |
| USIHO | Pimento | IN |
| USPXP | Pinckard | AL |
| USYVP | Pinckneyville | IL |
| USNXT | Pinconning | MI |
| USJPN | Pine | AZ |
| USPIQ | Piedmont | MO |
| USPIJ | Piedmont | SC |
| USS78 | Piedmont | SD |
| USPNT | Piedmont | WV |
| USPGN | Piegan | MT |
| USPJK | Pierce | ID |
| USP7N | Pierce | NE |
| USAZ8 | Pierce City | MO |
| USP8N | Pierceton | IN |
| USPR4 | Piercy | CA |
| USPI3 | Piermont | NH |
| USR9Y | Piermont | NY |
| USPIR | Pierre | SD |
| USPPQ | Pierre Part | LA |
| USPIF | Pierson | FL |
| USRZB | Pierz | MN |
| USPFY | Piffard | NY |
| USPIG | Pigeon | MI |